Magneto-ignition apparatus for internal-combustion engines



-I. BOHLI: MAGNETO IGNITION APPARATUS FOR INTERNAL'COMBUSTION ENGINES.

' APPLICATION FILED JULY 30, 1921.

1 41x134. I Patented Mama, 1922.

I f I fig. 1.

' 2* a J J 9 I I a 6 ranged inside the revolving m. ,fHQt.

PATENT OFFICE,

JACQUES BOHLI, OF OBACI-I-S'ULOTHURN, SWITZERLAND, ASSIGNOR TO THE SCINTILLA, 0F SOLOTHURN, SWITZERLAND.

MAGNETO-IGNITION APPARATUS FOR INTERNAL-COMBUSTION ENGINES.

Ill All 7,134. 7

Application filed July 30,

T 0 all whom, it may concern Be it known that I, JACQUES BOI-ILI, a citizen of the Swiss Republic, residing at Obach-Solothurn, Switzerland, have vented certain new and useful Improvements in Magneto-Ignition Apparatus for Internal- Combustion Engines, for which I have filed applications in Switzerland Feb. at, 1920, and in Germany Feb. 7, 1920, and of which the following is a specification.

in magneto-ignition apparatus for internal combustion engines it is often desirable that the point of ignition shall be varied automatically in dependence on the speed of revolution in such a manner that the ignition shall be retarded at low speeds of revolution, and shall be advanced at high speeds of revolution. In apparatus comprising a fixed ignition coil it is possible to eli'ect the 'ariation of the point of ignition by rotating the interrupter cam relatively to the revolving member of the ignition apparatus in the direction of advance or of retardation.

K According to this invention the members for varying the point of ignition arear- By this means the space that necessarily exists between the poles of the magnet is made use of.

The accompanying drawings illustrate an embodiment-of this invention.

Figure 1 shows the device in longitudinal section, and Figure 2 in cross section.

In the cover a of the revolving magnet a there is mounted the shaft Z) which carries the cam d. For low speeds of revolution this cam is normally set for the indicated direction of rotation of the magnet, in the position X-X (Fig. 2) relatively to the rotor a, and itis held in this position by the spring 7. The spring 7 has a constant tendency to pull towards each other the upper ends of two centrifugal weights'g that are adapted to swing abouta fulcrum pin-h that is mounted inthe magnet a at right angles to the shaft Z). The lower ends of the weights g engage diagonally opposite points of the length of the cross piece of the shaft 6 in such a manner that when the centrifugal weights are caused by the centrifugal action at high speeds of revolution, to move away from each other in opposition to the force of the spring f, they will exert upon the cross piece 6 and (through the latter) uponfthe Specification of Letters Patent.

Patented May 23, 1922.

1921. Serial No. 488,694.

cam, a torque which will cause the cam to rotate in the direction of advance relatively to the rotor a.

By reason of this advance, whose amount increases with the speed of revolution, it is possible by means of the prominences of the cam (I to attain for high speeds of revolution a. given maximum advance of the point of ignition that may be situated for instance in the axis Y-Y (Fig. 2). In such a case the maximum angular displacement of the cam (Z relatively to the magnet a, will have the value a.

\Vhat I claim is l. A magneto ignition device for internal combustion engines including a revolving magnet, a cam for determining the timing of the moment of ignition and means located within said magnet for automatically varying the relative timing of the moment of lgnition in accordance with the speed of revolution of said magnet.

2. A magneto ignition device for internal combustion engines including a revolving magnet, a cam for determining the timing of the moment of ignition, a centrifugal device within said magnet, and an axial extension of said cam adapted to coact with said centrifugal device whereby the relative timing (.f the moment of ignition is varied according to the speed of revolution of said magnet.

3. A magneto ignition device for internal combustion engines including a revolving magnet, a cam for determining the timing of the moment of ignition. an axial extension of said cam, a pair of weight members pivoted eccentrically and an elastic member connecting and restraining the motion of one pair of the ends of said weight members, while the other pair of ends of said weight members are adapted to coact with said cam extension to alter the relative angular position of said cam with regard to said revolving magnet, the said pair of weight members, said elastic member and said cam extension being located within the said revolving magnet.

In testimony whereof I have signed my name to this specification.

JACQUES BOHLI. Witnesses: ALoIs BRUGGISSER, FRIDA KURZ. 

